Improvement in soldering-irons



Uurrnn S'ra'rns Parana @rrron,

JOHN HOARD, OF PROVIDENCE, RHODE ISLAND.

IMPRQVEMENT IN SOLDERING-IRONS.

Specification forming part of Letters Patent No. 125,893, dated April23, 1872 antedated April 6, 1872.

To all whom it may concern:

Be it known that I, JOHN W.HOARD, of the city and county of Providence,in the State of Rhode Island, have made certain new and usefulImprovements in Soldering-Irons and I do hereby declare that thefollowing specification is a full, clear, and exact description thereof.

The object of my invention is to make a soldering-iron by combiningcertain metals, as hereinalter described, which enables me to producethe manufactured article at a much less expense than it has heretoforebeen made. Solderingirons have heretofore been made of copper, and froma solid bolt, on account of its great property of retaining heat, (beinga necessity,) and in solid form as it requires but a slight expenditureof labor to put it in working form. To cast it of that metal alone it becomes porous and spongy, unfit and valueless for such a use. I find, byexperiment, that a very little tin or zincsay a quarter of an ounce to apound of copper-enables me to produce a sound casting without detrimentto the iron, whereas, an undue proportion would spoil it for the purposeintended, by lessening its conducting power-making it hard and brittlewhen subjected to the necessary degree of heat.

The iron I use is hollow, having suitable airpassages, &c., to createwhich from solid metal necessitates much labor, a large waste ofmaterial, and makes it too expensive for common use. My purpose is toproduce about all the labor in the casting, and in so doing to oheapenthe product, and greatly benefit the public, by being able to furnishthem with a very useful improvement at a moderate price.

WVhat I claim as my invention,and desire to secure by Letters Patent, is

A soldering-iron east from metal composed of the elements, andpossessing the characteristics herein described.

JOHN W. HOABD.

W'itnesses:

WALTER B. VINCENT, JOHN D. W. TAYLOR.

